Probably a bad thermostat, i get that same code in the winter, for the past 3 years. Only happens when it gets really cold and it takes longer for the engine to warm up, I have the stat with me, but its a PITA on the 3400 to change.
_________________ 2002 Galaxy Silver Sedan - LS cluster - Debadged - Intrigue compass/autodim mirror - DIC - Regal graphite leather seats - LS console with floor shift conversion - Monte Carlo black leather steering wheel - LS springs - KYB GR-2 Struts - GMPP sway bars and rear STB - Fog light frontend harness - LS Bumper with fog lights - Painted trim and side skirts
2006 Nissan Murano - Autodim/compass mirror
2006 Mercedez-Benz E350 - Stock for stock, its faster than an SS, woot!
Like BBE said It's a bad thermostat, I have just replaced mine, I didn't get any codes or CEL but the car couldn't reach it's normal operating temperature, it was only at 140 all the time. When I removed it the thermostat was half open.
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